Data confidentiality : PHI is generally held under the legal
and ethical obligations of confidentiality. These health data
should be confidential and available only to the authorized
doctors or other caregivers. Thus, it is important to keep the
individual health information confidential, so that an
adversary cannot eavesdrop on the patient’s information.
Data eavesdropping may cause damage to the patient cannot read future messages transmitted after it leaves the
network, while in backward secrecy a sensor joining the
network cannot read any previously transmitted messages.